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Measurement of the prompt J/ψ pair production cross-section in pp collisions at √s =8 TeV with the ATLAS detector
ATLAS Collaboration
ATLAS Collaboration
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Abstract
The production of two prompt J/ψ mesons, each with transverse momenta pT>8.5 GeV and rapidity |y|<2.1, is studied using a sample of proton-proton collisions at s√=8 TeV, corresponding to an integrated luminosity of 11.4 fb−1 collected in 2012 with the ATLAS detector at the LHC. The differential cross-section, assuming unpolarised J/ψ production, is measured as a function of the transverse momentum of the lower-pT J/ψ meson, di-J/ψ pT and mass, the difference in rapidity between the two J/ψ mesons, and the azimuthal angle between the two J/ψ mesons. The fraction of prompt pair events due to double parton scattering is determined by studying kinematic correlations between the two J/ψ mesons. The total and double parton scattering cross-sections are compared with predictions. The effective cross-section of double parton scattering is measured to be σeff=6.3±1.6(stat)±1.0(syst) mb.
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2017-02-07
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SpringerOpen
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Aaboud, M., Aad, G., Abbott, B. et al. Eur. Phys. J. C (2017) 77: 76. https://doi.org/10.1140/epjc/s10052-017-4644-9